1066645401 has 32 divisors (see below), whose sum is σ = 1551052800. Its totient is φ = 650141184.

The previous prime is 1066645379. The next prime is 1066645403. The reversal of 1066645401 is 1045466601.

It is a happy number.

It is not a de Polignac number, because 1066645401 - 2⁵ = 1066645369 is a prime.

It is a super-2 number, since 2×1066645401² = 2275464822948901602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1066645403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135625 + ... + 143273.

It is an arithmetic number, because the mean of its divisors is an integer number (48470400).

Almost surely, 2^1066645401 is an apocalyptic number.

It is an amenable number.

1066645401 is a deficient number, since it is larger than the sum of its proper divisors (484407399).

1066645401 is a wasteful number, since it uses less digits than its factorization.

1066645401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7765.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1066645401 is about 32659.5376727840. The cubic root of 1066645401 is about 1021.7391197792.

The spelling of 1066645401 in words is "one billion, sixty-six million, six hundred forty-five thousand, four hundred one".